// SPDX-License-Identifier: GPL-2.0
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/*
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* Maxim Quad GMSL Deserializer I2C read/write driver
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*
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* Copyright (C) 2023 Rockchip Electronics Co., Ltd.
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*
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* Author: Cai Wenzhong <cwz@rock-chips.com>
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*
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*/
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/i2c-dev.h>
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#include "maxim4c_i2c.h"
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/* Write registers up to 4 at a time */
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int maxim4c_i2c_write_reg(struct i2c_client *client,
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u16 reg_addr, u16 reg_len, u32 val_len, u32 reg_val)
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{
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u32 buf_i, val_i;
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u8 buf[6];
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u8 *val_p;
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__be32 val_be;
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dev_info(&client->dev, "i2c addr(0x%02x) write: 0x%04x (%d) = 0x%08x (%d)\n",
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client->addr, reg_addr, reg_len, reg_val, val_len);
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if (val_len > 4)
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return -EINVAL;
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if (reg_len == 2) {
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buf[0] = reg_addr >> 8;
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buf[1] = reg_addr & 0xff;
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buf_i = 2;
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} else {
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buf[0] = reg_addr & 0xff;
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buf_i = 1;
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}
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val_be = cpu_to_be32(reg_val);
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val_p = (u8 *)&val_be;
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val_i = 4 - val_len;
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while (val_i < 4)
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buf[buf_i++] = val_p[val_i++];
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if (i2c_master_send(client, buf, (val_len + reg_len)) != (val_len + reg_len)) {
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dev_err(&client->dev,
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"%s: writing register 0x%04x from 0x%02x failed\n",
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__func__, reg_addr, client->addr);
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return -EIO;
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}
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return 0;
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}
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EXPORT_SYMBOL(maxim4c_i2c_write_reg);
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/* Read registers up to 4 at a time */
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int maxim4c_i2c_read_reg(struct i2c_client *client,
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u16 reg_addr, u16 reg_len, u32 val_len, u32 *reg_val)
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{
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struct i2c_msg msgs[2];
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u8 *data_be_p;
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__be32 data_be = 0;
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__be16 reg_addr_be = cpu_to_be16(reg_addr);
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u8 *reg_be_p;
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int ret;
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if (val_len > 4 || !val_len)
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return -EINVAL;
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data_be_p = (u8 *)&data_be;
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reg_be_p = (u8 *)®_addr_be;
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/* Write register address */
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msgs[0].addr = client->addr;
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msgs[0].flags = 0;
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msgs[0].len = reg_len;
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msgs[0].buf = ®_be_p[2 - reg_len];
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/* Read data from register */
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msgs[1].addr = client->addr;
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msgs[1].flags = I2C_M_RD;
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msgs[1].len = val_len;
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msgs[1].buf = &data_be_p[4 - val_len];
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ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
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if (ret != ARRAY_SIZE(msgs)) {
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dev_err(&client->dev,
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"%s: reading register 0x%04x from 0x%02x failed\n",
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__func__, reg_addr, client->addr);
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return -EIO;
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}
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*reg_val = be32_to_cpu(data_be);
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#if 0
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dev_info(&client->dev, "i2c addr(0x%02x) read: 0x%04x (%d) = 0x%08x (%d)\n",
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client->addr, reg_addr, reg_len, *reg_val, val_len);
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#endif
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return 0;
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}
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EXPORT_SYMBOL(maxim4c_i2c_read_reg);
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/* Update registers up to 4 at a time */
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int maxim4c_i2c_update_reg(struct i2c_client *client,
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u16 reg_addr, u16 reg_len, u32 val_len, u32 val_mask, u32 reg_val)
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{
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u32 value;
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int ret;
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ret = maxim4c_i2c_read_reg(client, reg_addr, reg_len, val_len, &value);
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if (ret)
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return ret;
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value &= ~val_mask;
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value |= (reg_val & val_mask);
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ret = maxim4c_i2c_write_reg(client, reg_addr, reg_len, val_len, value);
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return ret;
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}
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EXPORT_SYMBOL(maxim4c_i2c_update_reg);
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int maxim4c_i2c_write_byte(struct i2c_client *client,
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u16 reg_addr, u16 reg_len, u8 reg_val)
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{
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int ret = 0;
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ret = maxim4c_i2c_write_reg(client,
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reg_addr, reg_len,
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MAXIM4C_I2C_REG_VALUE_08BITS, reg_val);
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return ret;
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}
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EXPORT_SYMBOL(maxim4c_i2c_write_byte);
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int maxim4c_i2c_read_byte(struct i2c_client *client,
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u16 reg_addr, u16 reg_len, u8 *reg_val)
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{
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int ret = 0;
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u32 value = 0;
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u8 *value_be_p = (u8 *)&value;
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ret = maxim4c_i2c_read_reg(client,
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reg_addr, reg_len,
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MAXIM4C_I2C_REG_VALUE_08BITS, &value);
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*reg_val = *value_be_p;
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return ret;
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}
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EXPORT_SYMBOL(maxim4c_i2c_read_byte);
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int maxim4c_i2c_update_byte(struct i2c_client *client,
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u16 reg_addr, u16 reg_len, u8 val_mask, u8 reg_val)
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{
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u8 value;
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int ret;
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ret = maxim4c_i2c_read_byte(client, reg_addr, reg_len, &value);
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if (ret)
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return ret;
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value &= ~val_mask;
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value |= (reg_val & val_mask);
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ret = maxim4c_i2c_write_byte(client, reg_addr, reg_len, value);
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return ret;
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}
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EXPORT_SYMBOL(maxim4c_i2c_update_byte);
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int maxim4c_i2c_write_array(struct i2c_client *client,
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const struct maxim4c_i2c_regval *regs)
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{
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u32 i = 0;
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int ret = 0;
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for (i = 0; (ret == 0) && (regs[i].reg_addr != MAXIM4C_REG_NULL); i++) {
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if (regs[i].val_mask != 0)
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ret = maxim4c_i2c_update_reg(client,
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regs[i].reg_addr, regs[i].reg_len,
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regs[i].val_len, regs[i].val_mask, regs[i].reg_val);
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else
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ret = maxim4c_i2c_write_reg(client,
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regs[i].reg_addr, regs[i].reg_len,
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regs[i].val_len, regs[i].reg_val);
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if (regs[i].delay != 0)
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usleep_range(regs[i].delay * 1000, regs[i].delay * 1000 + 100);
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}
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return ret;
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}
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EXPORT_SYMBOL(maxim4c_i2c_write_array);
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static int maxim4c_i2c_parse_init_seq(struct device *dev,
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const u8 *seq_data, int data_len, struct maxim4c_i2c_init_seq *init_seq)
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{
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struct maxim4c_i2c_regval *reg_val = NULL;
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u8 *data_buf = NULL, *d8 = NULL;
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u32 i = 0;
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if ((seq_data == NULL) || (init_seq == NULL)) {
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dev_err(dev, "%s: input parameter = NULL\n", __func__);
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return -EINVAL;
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}
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if ((init_seq->seq_item_size == 0)
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|| (data_len == 0)
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|| (init_seq->reg_len == 0)
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|| (init_seq->val_len == 0)) {
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dev_err(dev, "%s: input parameter size zero\n", __func__);
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return -EINVAL;
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}
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// data_len = seq_item_size * N
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if (data_len % init_seq->seq_item_size) {
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dev_err(dev, "%s: data_len or seq_item_size error\n", __func__);
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return -EINVAL;
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}
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// seq_item_size = reg_len + val_len * 2 + 1
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if (init_seq->seq_item_size !=
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(init_seq->reg_len + init_seq->val_len * 2 + 1)) {
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dev_err(dev, "%s: seq_item_size or reg_len or val_len error\n", __func__);
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return -EINVAL;
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}
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data_buf = devm_kmemdup(dev, seq_data, data_len, GFP_KERNEL);
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if (!data_buf) {
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dev_err(dev, "%s data buf error\n", __func__);
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return -ENOMEM;
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}
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d8 = data_buf;
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init_seq->reg_seq_size = data_len / init_seq->seq_item_size;
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init_seq->reg_seq_size += 1; // add 1 for end register setting
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init_seq->reg_init_seq = devm_kcalloc(dev, init_seq->reg_seq_size,
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sizeof(struct maxim4c_i2c_regval), GFP_KERNEL);
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if (!init_seq->reg_init_seq) {
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dev_err(dev, "%s init seq buffer error\n", __func__);
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return -ENOMEM;
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}
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for (i = 0; i < init_seq->reg_seq_size - 1; i++) {
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reg_val = &init_seq->reg_init_seq[i];
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reg_val->reg_len = init_seq->reg_len;
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reg_val->val_len = init_seq->val_len;
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reg_val->reg_addr = 0;
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switch (init_seq->reg_len) {
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case 4:
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reg_val->reg_addr |= (*d8 << 24);
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d8 += 1;
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fallthrough;
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case 3:
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reg_val->reg_addr |= (*d8 << 16);
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d8 += 1;
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fallthrough;
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case 2:
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reg_val->reg_addr |= (*d8 << 8);
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d8 += 1;
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fallthrough;
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case 1:
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reg_val->reg_addr |= (*d8 << 0);
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d8 += 1;
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break;
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}
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reg_val->reg_val = 0;
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switch (init_seq->val_len) {
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case 4:
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reg_val->reg_val |= (*d8 << 24);
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d8 += 1;
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fallthrough;
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case 3:
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reg_val->reg_val |= (*d8 << 16);
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d8 += 1;
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fallthrough;
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case 2:
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reg_val->reg_val |= (*d8 << 8);
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d8 += 1;
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fallthrough;
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case 1:
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reg_val->reg_val |= (*d8 << 0);
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d8 += 1;
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break;
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}
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reg_val->val_mask = 0;
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switch (init_seq->val_len) {
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case 4:
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reg_val->val_mask |= (*d8 << 24);
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d8 += 1;
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fallthrough;
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case 3:
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reg_val->val_mask |= (*d8 << 16);
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d8 += 1;
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fallthrough;
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case 2:
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reg_val->val_mask |= (*d8 << 8);
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d8 += 1;
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fallthrough;
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case 1:
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reg_val->val_mask |= (*d8 << 0);
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d8 += 1;
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break;
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}
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reg_val->delay = *d8;
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d8 += 1;
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}
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// End register setting
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init_seq->reg_init_seq[init_seq->reg_seq_size - 1].reg_len = init_seq->reg_len;
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init_seq->reg_init_seq[init_seq->reg_seq_size - 1].reg_addr = MAXIM4C_REG_NULL;
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return 0;
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}
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int maxim4c_i2c_load_init_seq(struct device *dev,
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struct device_node *node, struct maxim4c_i2c_init_seq *init_seq)
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{
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const void *init_seq_data = NULL;
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u32 seq_data_len = 0, value = 0;
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int ret = 0;
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if ((node == NULL) || (init_seq == NULL)) {
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dev_err(dev, "%s input parameter error\n", __func__);
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return -EINVAL;
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}
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init_seq->reg_init_seq = NULL;
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init_seq->reg_seq_size = 0;
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if (!of_device_is_available(node)) {
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dev_info(dev, "%pOF is disabled\n", node);
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return 0;
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}
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init_seq_data = of_get_property(node, "init-sequence", &seq_data_len);
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if (!init_seq_data) {
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dev_err(dev, "failed to get property init-sequence\n");
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return -EINVAL;
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}
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if (seq_data_len == 0) {
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dev_err(dev, "init-sequence date is empty\n");
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return -EINVAL;
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}
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ret = of_property_read_u32(node, "seq-item-size", &value);
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if (ret) {
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dev_err(dev, "failed to get property seq-item-size\n");
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return -EINVAL;
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} else {
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dev_info(dev, "seq-item-size property: %d", value);
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init_seq->seq_item_size = value;
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}
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ret = of_property_read_u32(node, "reg-addr-len", &value);
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if (ret) {
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dev_err(dev, "failed to get property reg-addr-len\n");
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return -EINVAL;
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} else {
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dev_info(dev, "reg-addr-len property: %d", value);
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init_seq->reg_len = value;
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}
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ret = of_property_read_u32(node, "reg-val-len", &value);
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if (ret) {
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dev_err(dev, "failed to get property reg-val-len\n");
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return -EINVAL;
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} else {
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dev_info(dev, "reg-val-len property: %d", value);
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init_seq->val_len = value;
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}
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ret = maxim4c_i2c_parse_init_seq(dev,
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init_seq_data, seq_data_len, init_seq);
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if (ret) {
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dev_err(dev, "failed to parse init-sequence\n");
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL(maxim4c_i2c_load_init_seq);
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int maxim4c_i2c_run_init_seq(struct i2c_client *client,
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struct maxim4c_i2c_init_seq *init_seq)
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{
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int ret = 0;
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if (init_seq == NULL || init_seq->reg_init_seq == NULL)
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return 0;
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ret = maxim4c_i2c_write_array(client,
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init_seq->reg_init_seq);
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return ret;
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}
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EXPORT_SYMBOL(maxim4c_i2c_run_init_seq);
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